1. The problem statement, all variables and given/known data Find and classify all critical points of [tex]f(x,y) = x^3+2y^3-3x^2-3y^2-12y[/tex] 2. Relevant equations 3. The attempt at a solution So I've gotten to [tex]Fx = 3x^2 - 6x = 0[/tex] [tex]Fy = 6y^2 - 6y - 12 = 0[/tex] [tex]x=0, x=2, y=-1, y=2[/tex] Now I can't remember how to find the critical points from here. Any help is appreciated!